Fig. 4
Dust/gas correlation in N1 (top-left), MC (top-right) and BOOTES (bottom): Planck and IRAS raw maps (left column), the model of the dust emission based on the Hi observations (middle: Hi model, 
, Eq. (2)) and the residual emission (right, see Eq. (6)). Units are MJysr-1. Data are described in Sect. 3 and model and residual in Sect. 4.
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